Dude the Demo is balls compared to the retail version. First of all you can only use default sounds which sux if you are using a sound pack (FDF mod) idk I had problems on the demo but not my retail copy of arma.

p.s. When I said the sound is crap I didn't mean like the gun sounds that are unrealistic but I meant that every sound (including the background music) is fucked up. And not in a 'they-did-it-wrong'-kinda way, but in a wtf is going on with my sound kinda way.

im really getting into this, had 6 guys all on TS ambushing a convoy, 3 at rockets and 6 satchel charges later 3 BMP's and a T-72 were wrecked but we got overrun by troops.

bullets, RPG's, the kitchen sink... everyhting was being thrown at us... me and another guy with machine guns opened up like crazy, eventully the only guy left was the SL'er and he decided to run off and hide! the AI caught him in the end tho! i guess he needed a bigger tree to hide behind!